Welcome to FOG

Always good to put your country of origin so when you ask for help folks can offer you websites and links for your country.
Why not just purchase the MW1000 extension table? I have a few complaints with it, but it still functions great as an extension table for an MFT/3. It even nests inside the folded MFT/3, and it is reasonably lite. The dog holes are loosy goosy though, and do not line up at all with the MFT/3 dog holes.
Another option is to just make a table from scratch. It is very easy to cut a hardwood piece to fit into the V groove of the MFT/3 and attach an MDF top to it. Rig some kind of adjustable legs to it and you got a table extension. If it is longer, attach some hardwood to the bottom of the MDF for stiffeners.